1944] Genus Pseudomyrma 79 
The new form is sufficiently different from spinicola to be 
listed as a separate species. The structure of the thorax of the 
new species is in marked contrast to that of P. spinicola ; it is 
evenly convex in profile, without any depression at the mes- 
epinotal suture. From above this suture is very faint, nearly 
obsolete. The mandibles are almost as dark as the rest of the 
head, a feature which distinguishes P. triplaridis, which how- 
ever belongs to another branch. The mandibles are curiously 
flattened, as if they had been artificially crushed, and strongly 
rugose, each ruga leading to a tooth. The frontal carinae are 
very close together. 
Type locality: Antigua, Guatemala (Wheeler coll.). 
Holotype No. 84, Haskins Collection; two paratypes. 
Pseudomyrma antiguana var. brunnipes var. nov. 
Worker. 
Length 6 mm. With the general features of the type, that is 
the flattened mandibles and the very faint mesepinotal suture. 
It differs from the type by its shorter and more robust petiole, 
which has a shorter peduncle. The frontal carinae are longer 
and farther apart than in the type. The color pattern is very 
striking. The whole body, including the mandibles and legs, 
dark reddish brown and contrasting very sharply with the 
thorax and petiole, both of which are bright yellow on the sides 
and brownish yellow dorsally. The petiolar node is almost as 
dark as the postpetiole and gaster. The second abdominal seg- 
ment has the anterior half golden yellow, the posterior half 
dark brown. 
Type locality: San Lucas, Toliman, Guatemala (Wheeler 
coll.). 
Holotype No. 85, Haskins Collection. 
Pseudomyrma arboris-sanctae var. ecuadoriana, var. nov. 
Worker. 
Described from numerous workers collected for us in Ecua- 
dor. Length 5.5 mm. Head longer than broad, with very 
convex sides and straight posterior border. Mandibles very 
strongly striate, with two large apical and several small blunt 
basal teeth. The clypeal lobe is very short and rectangular. 
The scapes are much thickened apically and reach the middle of 
the eyes. Head densely foveolate, not punctate; on the occiput 
